William w



(No Model.)`

W. W. STEWART.

PUUNTAIN STYLUS PEN. y No. 291,800. Patented Jan. 8,'1884.

Eg. 2f.

Inv e nfl/Lor L a I ev K1 8 N PETERS4 Phowmnaguphn wnmgxon. D. c.

tirarmi-zn @rares Pari-liar @einen WILLIAM .V. STEWART, OF BROOKLYN, NEW YORK.

FOUNTAIN STYLUS-PEN.

SPECIFICATION forming part of Letters Patent No. 291,800, dated January 8, 1884.

Application filed February Q7, 1882.

(No model.)

T0 all w/wm it may concern:

Be it known that I,WILLIAM W. STEWART, of Brooklyn, Kings county, in the State of New York, have invented new and useful Improvements in Fountain Stylus Pens; and I do hereby declare that the following is a full and accurate description of the same.

The object of this invention is, iirst, to provide the stylus-pen with a capacity to equalize the iiow of ink under all circumstances by providing for the expansion and contraction of the iiuid ink inthe holder without permitting an undue flow or an absence of discharge at the stylus; second, to provide a stylus of some suitable animal substance which will not become permeated-such as horse hair, quill, Src-which are softer to the touch, yield more delicately, and deliver the ink in a finer mark.

That others may fully understand my iinprovement, I will particularly describe it, having reference to the accompanying drawings, wherein- Figure l is a longitudinal section of my pen with the parts in place. Figs. 2 and 3 are sections showing modifications.

A. is the reservoir, terminating at one end with a hollow head, a, and at the other with a pen or stylus point section, B. Vthin this last there is acondensing-chamber, b, connecting at its lower end with the tube whereby ink is delivered to the pen or stylus, and at its upper end with a froth or iilm tube, c,which pro- `jects up into the ink-space of the reservoir and is in communication with the same by means of holes d near its junction with the condensing-chamber and a hole, c, at its extremity. rlhe extremity of the point-section is inclosed within a jacket, E, having a little space within it around the point-section, but not touching the point-section at its extremity. The effect of this arrangement is to permit expansion and contraction of the ink at the discharge without danger of overiiow, because capillary attraction will cause the ink to iiow up into the space within the jacket instead of dctaching and falling upon the paper.

I find it advantageous to employ whatI call irritants within the reservoir, to facilitate the formation of froth or film in the upper part of the reservoir, and thereby free the ink from the particles of air which it would otherwise absorb from the little bubbles of entering air. These irritants consist of strands S, of some non-absorbent snbstancesuch as horse-hair, glass,polished gold, latina,&c. Thesestrands, one or more in each pen, are attached by securing the two ends to the wall of the reservoir in some suitable way, leaving the central part loose, compelling the film to form a line along the irritants.

I also find it advantageous to place within the reservoir one or more diaphragms or divisions, G, which, while they do not separate the reservoir into distinct sections, still practically confine the ink and prevent its ready flow from one part ofthe reservoir to another when the same is only partly iilled, and thereby connue the ink at the lower end in the vicinity ofthe ink-chamber b.

I have also discovered that forstylus-pens a stylus-point made ofhorse-hair or some similar non-absorbent substance has advantages over the rigid iridiuin-tipped stylus-points heretofore made. It is softer and pleasanter Lto the touch. It is capable of delivering the ink in a finer stream, and thereby producing a ner niark upon paper, and it is much cheaper.

In the drawings, H represents the horse-hair stylus, lined in a cylinder, I, of metal, which may be constructed so as to act asavalve when the pen is out of action. .I is a fine gold wire, which extends upward from weight I through the film-chamber, bearing against the walls of said chamber with sufficient force to maintain the weight in posit-ion.'v If desired, however, the weight I may be omitted, and a delicate spiral spring, K, on the wire J or stylus may be substituted. A small collar, Z, is placed on said wire, and the springK is confined between said collar and the end of the nlm-tube, so that its tendency is always to project the stylus from the point, fet to let it yield and recede when pressure is applied while writing.

Having now described my improvement, what I claim as new isl. The pen-point section B of a stylus-pen, combined with the inclosing-jacket E, to provide a capillary space between, substantially as set forth.

2. In a reservoir-pen holder, an ink space IOO or reservoir, combined With an agitator, S, of 4. In a reservoir-pen, the reservoir or inknon-absorbent material and polished surface, space provided with one or more diaphragms inserted in said reservoir, and called by me an or partitions, G, partly separating said ink- 15 irritant,77 for the purpose of preventing the space into separated chambers, as and for the accumulation of iuid in the center ofthe holder purpose set forth. and the consequent division of the eoluinn of 5. In a stylus fountain-pen, a stylus-point of ink. horse-hair or yother non-absorbent substance,

3. In a reservoir-pen, an ink space or resersubstantially as set forth. voir, combined With an irritant composed of VILLIAM W. STEWART.

horse-hair, gold, or other non-absorbent ina- Witnesses: terial, the ends whereof are fixed, substantial- D. A. SAYRE, ly as and for the purpose set forth. G. W. TRACY. 

